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Comparison of microbiologically influenced corrosion of structural steel by nitrate-reducing bacteria in aerobic and anaerobic conditions
Highlights Corrosion of the steel by Bacillus licheniformis was studied comparatively in the aerobic and anaerobic conditions. Corrosion resistance of the steel increases first and then decreases in the presence of Bacillus licheniformis over time. Compared to the aerobic inoculated medium, the corrosion process of the steel in the anaerobic one is promoted. The serious corrosion of steel is attributed to the intensive denitrification occurred in the anaerobic condition.
Abstract The corrosion of Q235 steel by Bacillus licheniformis was comparatively studied in the aerobic and anaerobic conditions using immersion tests, electrochemical measurements and surface characterizations. Results showed that the biofilm thickness and compactness increased first and decreased in both conditions. Accordingly, the corrosion resistance of Q235 steel displayed a similar trend over time. Overall, the presence of Bacillus licheniformis promoted the corrosion process in both conditions definitely. By contrast, the weight loss and the pit depth of Q235 steel in the anaerobic inoculated medium were higher than in the aerobic one, which implied that anaerobic condition had a greater acceleration effect of the corrosion by Bacillus licheniformis. This was attributed to the different bacterial metabolisms in the two different media, i.e., oxygen reduction in the aerobic condition and nitrate reduction in the anaerobic condition.
Comparison of microbiologically influenced corrosion of structural steel by nitrate-reducing bacteria in aerobic and anaerobic conditions
Highlights Corrosion of the steel by Bacillus licheniformis was studied comparatively in the aerobic and anaerobic conditions. Corrosion resistance of the steel increases first and then decreases in the presence of Bacillus licheniformis over time. Compared to the aerobic inoculated medium, the corrosion process of the steel in the anaerobic one is promoted. The serious corrosion of steel is attributed to the intensive denitrification occurred in the anaerobic condition.
Abstract The corrosion of Q235 steel by Bacillus licheniformis was comparatively studied in the aerobic and anaerobic conditions using immersion tests, electrochemical measurements and surface characterizations. Results showed that the biofilm thickness and compactness increased first and decreased in both conditions. Accordingly, the corrosion resistance of Q235 steel displayed a similar trend over time. Overall, the presence of Bacillus licheniformis promoted the corrosion process in both conditions definitely. By contrast, the weight loss and the pit depth of Q235 steel in the anaerobic inoculated medium were higher than in the aerobic one, which implied that anaerobic condition had a greater acceleration effect of the corrosion by Bacillus licheniformis. This was attributed to the different bacterial metabolisms in the two different media, i.e., oxygen reduction in the aerobic condition and nitrate reduction in the anaerobic condition.
Comparison of microbiologically influenced corrosion of structural steel by nitrate-reducing bacteria in aerobic and anaerobic conditions
2021-03-15
Article (Journal)
Electronic Resource
English
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